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Message Posted: Thu, 02 May 2013 @ 10:18:40 GMT


     
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Subj:   Parameters to judge Query Performance
 
From:   Anomy Anom

<-- Anonymously Posted: Wednesday, May 01, 2013 17:38 -->

Hi Experts,

What parameter are important to judge a query performance I am always looking in to AMPCputime (Total CPU Time) but I have seen some queries even with less AmpCpu time also causing system degrade.

I saw many times ?AMP I/O Skew Shows red on Viewpoint ?when this occur other queries are getting delayed is there any query to pull all high AMP I/O Skew queries.

Since recently we had a issue with a query ran 2 min when AMPI/OSkew is high and the same query again after AMPI/OSkew normal state just ran in 30 seconds I want to know what impacted this query and how to know the cause.

Please advise I need explain our customers.

If you have any scripts to see the bang queries at particular time please post would be great.


Thank you.



     
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